Add a scoping object to help block scripting during plugin destruction.

Source/core/frame/RemoteFrame.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/RemoteFrame.h"
 
 #include "bindings/core/v8/WindowProxy.h"
 #include "bindings/core/v8/WindowProxyManager.h"
 #include "core/dom/RemoteSecurityContext.h"
 #include "core/frame/RemoteDOMWindow.h"
 #include "core/frame/RemoteFrameClient.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/html/HTMLFrameOwnerElement.h"
 #include "core/layout/LayoutPart.h"
 #include "core/loader/FrameLoadRequest.h"
 #include "core/paint/DeprecatedPaintLayer.h"
+#include "platform/PluginScriptForbiddenScope.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/weborigin/SecurityPolicy.h"
 #include "public/platform/WebLayer.h"
 
 namespace blink {
 
 inline RemoteFrame::RemoteFrame(RemoteFrameClient* client, FrameHost* host, FrameOwner* owner)
     : Frame(client, host, owner)
     , m_securityContext(RemoteSecurityContext::create())
@@ skipping 49 matching lines @@
     navigate(*passedRequest.originDocument(), passedRequest.resourceRequest().url(), passedRequest.lockBackForwardList(), gesture);
 }
 
 void RemoteFrame::reload(FrameLoadType frameLoadType, ClientRedirectPolicy clientRedirectPolicy)
 {
     remoteFrameClient()->reload(frameLoadType, clientRedirectPolicy);
 }
 
 void RemoteFrame::detach()
 {
+    PluginScriptForbiddenScope forbidPluginDestructorScripting;
     // Frame::detach() requires the caller to keep a reference to this, since
     // otherwise it may clear the last reference to this, causing it to be
     // deleted, which can cause a use-after-free.
     RefPtrWillBeRawPtr<RemoteFrame> protect(this);
     detachChildren();
     if (!client())
         return;
     client()->willBeDetached();
     m_windowProxyManager->clearForClose();
     setView(nullptr);
@@ skipping 66 matching lines @@
     if (m_remotePlatformLayer)
         GraphicsLayer::registerContentsLayer(layer);
 
     ASSERT(owner());
     toHTMLFrameOwnerElement(owner())->setNeedsCompositingUpdate();
     if (LayoutPart* layoutObject = ownerLayoutObject())
         layoutObject->layer()->updateSelfPaintingLayer();
 }
 
 } // namespace blink